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【单选题】
11-6-3 如图所示,半径为 R 的半圆形线圈,通电流为 I ,处在磁感强度为 B 的磁场中,磁感 应线与线圈平面垂直,则半圆线圈所受的大小为?,方向为?A.
,水平向左
B.
，水平向右
C.
,水平向左
D.
，水平向右
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举一反三
【单选题】Where is the Yoga Center?
A.
The Yoga Center is on Seventh Street.
B.
The Yoga Center is on Seventeenth Street.
C.
The Yoga Center is next to a Chinese restaurant.
【单选题】Where is the Business Center?
A.
In the office, madam.
B.
On the first floor, madam.
C.
It is open now, madam.
D.
It opens at 9:00 o’clock, madam.
【单选题】Three particles of masses m 1 = 1.2kg, m 2 = 2.5kg, and m 3 = 3.4kg form an equilateral triangle (等边三角形) of edge length a = 140cm. Where is the center of mass (x COM , y COM ) of this system?
A.
(100cmm, 150cm)
B.
(83cm, 58cm)
C.
(-83cm, 58cm)
【简答题】基因工程抗体类型包括（）,（）,?（）?,（）等.[每空1分]
【单选题】Where is the center of universe?
A.
the Earth
B.
the Milky Way
C.
the Mars
D.
We don't know.
【单选题】Where is the center of tulip breeding? _____________
A.
Turkey
B.
Old World
C.
Holland
D.
the United States
【单选题】Where is the center for students life on campus?
A.
Main Quad
B.
Oval
C.
Dormitory
D.
White Plaza
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